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3×3 Split Ring resonators with inner ring rotation are etched at the back side of Circular microstrip antenna with elliptical rings. Rotation for multiple angles leads to an enhancement in impedance bandwidth. The selected UWB antenna has fabrication dimensions of 45 mm × 31mm × 1.27 mm. The rotation of the inner rings occur clockwise and counter clockwise for −47°, 33° and 10°. The preferable enhanced...
This paper presents a compact low-profile elliptical planner antenna for UWB applications. The antenna is fabricated using Rogers 5880 LZ substrate, conducting patch, and conducting ground plane. The antenna size is 41.95mm×21.2 mm×1.27mm. The operating bandwidth of the designed antenna is from 2.5–10.5 GHz, which make the antenna useful for UWB applications. The length of the ground plane is selected...
The charge-steering concept is applied to opamps as a means of conserving power. The opamp is the heart of the sigma-delta modulator circuit and the part in which the major portion of the power consumption is dissipated. This work presents a dual mode sigma-delta modulator for two wireless standards, GSM and Bluetooth. It achieves dual-mode operation with the same sampling frequency, while the capacitor...
The conventional current-steering Opamp is the building block of sigma-delta modulator circuits. It is also the major power consuming part of the circuit. The chargesteering concept can be applied to Opamps to obtain minimum power consumption. The two-stage charge-steering Opamp has been designed using 0.18um TSMC CMOS technology that consumes 0.23 mW power at a 48 MHz sampling frequency. A 2nd order,...
Large-scale distribution, communication and processing of sensed information require the operation of a highly-dynamic, dense, and widely-distributed wireless sensor network. Existing centralized and decentralized solutions require the use of information that may not be readily available to the nodes in a timely fashion. Instead of seeking such techniques, in this paper we propose an evolutionary...
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